LOL, I would not go back to that shop if I were you, joefufu. The "special" wires come with the exhaust, along with instructions. I did it myself. It was pretty much just like extending speaker wire or something like that. Just follow the instructions carefully or find a shop that is willing to read instructions. Also, make sure you or whoever you get to do it, insulates the fcuk out of the connectors and the extension.
EDIT: LOL, you must have been posting while I was writing. You need a good set of wire strippers, a good set of crimpers, and some good insulating materiel. I may have gone overboard, but I used Heatshrink Tubing, then electrical tape, then cold shrink tape.
Haze20 & RenzoMSP. I used new kartboy hangers and I have no clunk at all. However, I could not use the kartboy on the very back, near the bumper. It made the tip of the exhaust sit way too close to the rear bumper. I was kinda afraid that it would melt the rear piece of the body kit. I actually got a hanger from a local exhaust shop that's a little longer and it works great. Probably could have just used one of the stock hangers but I just cut the stock ones off.